"""
in 和not in的使用
"""

def testInOperator():
    # 是对象的序列就返回true

    a = [1,2,3]

    print("a is {}".format(a))

    print("2 in a is {}".format(2 in a))

    print("5 not in a is {}".format(5 not in a))

testInOperator()